ABSTRACT:

The Guangzhou Pumped Storage Power Station in Guangdong Province, China, is being constructed in two stages each of 1200 MW. Stage I came into reliability operation in March 1994 and Stage II will be operational in 1999. When the overall project is completed, the scheme will be the largest pumped storage facility in the world. This paper provides a brief description of the scheme and outlines some of the main rock engineering considerations in the design and construction of the underground works.

RESUME:

La Guangzhou Pumped Storage Power Station dans la province de Guangdong, Chine, est en cours de construction en deux phases, chacune de 1200 MW. La phase I a ete operationnelle en Mars 1994 et la phase II sera operationnelle en 1999. Une fois terminee, il s'agira de la plus grande station de pompage du monde. Ce texte donne une brève description du projet et met à jour des considerations du Point vue de l'ingenierie de roche les plus importantes concernant la conception et la construction des travaux souterrains.

ZUSAMMENFASSUNG:

Die unterirdische Zentrale von Guangzhou in der Provinz Guandong in China wird In zwei Stadien zu je 1200 MW gebaut. Der erste Bauabschnitt wurde im Marz 1994 fertiggestellt, und der Zweite wird 1999 abgeschlossen. Nach seiner Beendigung wird dieses Projekt das größte seiner Art auf der ganzen Welt sein. Diese Arbeit liefert eine kurze Beschreibung des Schemas und stellt einige der ingenieurwissenschaftlichen Hauptprobleme bei Felsarbeiten fuer die Planung und den Bau von unterirdischen Anlagen dar.

1. INTRODUCTION

China has a long tradition of hydropower with water wheels having been used as far back as the Han Dynasty (206BC - 8AD). The first hydroelectric Power station was built in Yunnan province in 1910- 1912 but after this only limited progress was made with hydropower development in the first half of this century. Following the founding of the People's Republic of China, the total hydropower capacity has risen from about 160 MW in 1949 to 38,000 MW in 1991. A recent survey of hydropower development in China (Cheng Xuemin, 1994) notes that in 1994 there were 42 projects in operation or under construction with capacities greater than 250 MW. The 2400 MW Guangzhou Pumped Storage Project which is currently under construction not only represents a major milestone in Chinese hydropower development but also constitutes a world first in pumped storage capacity as well as setting notable milestones for engineering quality, low cost per installed kW, highest specific power 300 MW units and speed of construction. Because of the abundance of conventional hydropower sites in China, the development of pumped storage technology has been relatively slow with the earlier schemes being relatively small and usually incorporated into irrigation dams. Cheng Xuemen's review notes that the sharp increase in peak load demand following China's rapid economic development since the late 70's has resulted in a demand for large pumped storage plants. In 1994, there were five projects under construction with an aggregate capacity of 3500 MW and a dozen projects aggregating 15 GW at various design stages. The Guangzhou Pumped Storage Power Station (GPSPS) is located in Lutian County which forms part of the Conghua district of Guangdong Province in China. As shown in Figure 1, the site is about 120 km from the provincial capital of Guangzhou, which in turn is about 125 km northwest of Hong Kong. The main elements of the scheme are the dams, reservoirs, hydraulic tunnels and underground power caverns. The lower reservoir is located in a peaceful fertile valley where the farmers of the village of Xiao San have cultivated their rice and groundnuts for thousands of years. An important early stage of the scheme was to resettle the farmers into modern housing on the edge of the new lake. The upper and lower reservoirs are located on secondary tributaries of the Liuxi River and the new lakes add a further scenic feature to the majestic mountain setting.

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